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Issue 9, 2018
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Two-electron oxidation of water to form hydrogen peroxide catalysed by silicon-porphyrins

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Abstract

The second most earth abundant atom incorporated meso-tetrapyridylporphyrinatesilicon(IV) (SiTPyP) as an electrochemical catalyst was newly synthesized. The two axially ligated water molecules on SiTPyP and the four meso-substituted pyridyl nitrogens suffer eight-step protonations and deprotonations. Our detailed pKa study indicated that the two axially ligated water molecules were fully deprotonated to exist as O–Si–O under the condition of pH > 2. Under basic conditions, SiTPyP(O)2 exerted the two-electron oxidation of water to form hydrogen peroxide as the primary product in aqueous acetonitrile, which was initiated through a one-electron oxidation process on the electrode with faradaic yield of 84–92%.

Graphical abstract: Two-electron oxidation of water to form hydrogen peroxide catalysed by silicon-porphyrins

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Article information


Submitted
02 Mar 2018
Accepted
23 Mar 2018
First published
27 Mar 2018

Sustainable Energy Fuels, 2018,2, 1966-1973
Article type
Paper

Two-electron oxidation of water to form hydrogen peroxide catalysed by silicon-porphyrins

S. N. Remello, F. Kuttassery, S. Mathew, A. Thomas, D. Yamamoto, Y. Nabetani, K. Sano, H. Tachibana and H. Inoue, Sustainable Energy Fuels, 2018, 2, 1966 DOI: 10.1039/C8SE00102B

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